Hydrogel compositions

Abstract

Fragmented polysaccharide based hydrogel compositions and methods of making and using the same are provided. The subject polysaccharide based hydrogel compositions are prepared by combining a polysaccharide component with a hydrophilic polymer and a cross-linking agent. Also provided are kits and systems for use in preparing the subject compositions.

That which is claimed is: 
     
       1. A composition, comprising
 a biologically active agent; and 
 a hydrogel comprising an acetylated polysaccharide, a multifunctional, multi-armed polyethylene glycol polymer and a multifunctional, multi-armed crosslinker of polyethylene glycol, wherein:
 the acetylated polysaccharide or derivative thereof has a molecular weight of 1000 Dalton to 80,300 Dalton, a degree of deacetylation of 70% to 99%, and at least two nucleophilic groups and is directly covalently bonded to the multifunctional, multi-armed polyethylene glycol polymer and directly covalently bonded to the multifunctional, multi-armed crosslinker of polyethylene glycol; 
 the multifunctional, multi-armed polyethylene glycol polymer has a molecular weight of 5,000 Dalton to 30,000 Dalton, and comprises at least two nucleophilic groups and is directly covalently bonded to the acetylated polysaccharide or derivative thereof and is directly covalently bonded to the multifunctional, multi-armed crosslinker of polyethylene glycol; and 
 the multifunctional, multi-armed crosslinker of polyethylene glycol has a molecular weight of 5,000 Dalton to 30,000 Dalton, and comprises at least two electrophilic groups and is directly covalently bonded to the acetylated polysaccharide or derivative thereof and is directly covalently bonded to the multifunctional, multi-armed polyethylene glycol polymer, 
 wherein the acetylated polysaccharide or derivative thereof does not act as a cross-linking agent in the hydrogel. 
 
 
     
     
       2. The composition of  claim 1 , wherein the biologically active agent is a steroid. 
     
     
       3. The composition of  claim 2 , wherein the steroid is mometasone furoate or triamcinolone. 
     
     
       4. The composition of  claim 1 , wherein the biologically active agent is an antibiotic. 
     
     
       5. The composition of  claim 4 , wherein the antibiotic is gentamicin. 
     
     
       6. The composition of  claim 1 , wherein the biologically active agent is a plasma protein, an enzyme, an antiseptic agent, an antineoplastic agent, an antifungal agent, an antiviral agent, an anti-inflammatory agent, a growth factor, an anesthetic, a cell suspension, a cytotoxin, a cell proliferation inhibitor, a biomimetic, an analgesic, a chemotherapeutic, a vasoconstrictor, a vasodilator, a cholesterol-lowering agent, a procoagulant, a selective serotonin reuptake inhibitor, a bone morphogenic protein, a growth factor, or a growth factor analog. 
     
     
       7. The composition of  claim 1 , wherein the acetylated polysaccharide or derivative thereof is a chitin, chitosan, or derivative thereof. 
     
     
       8. The composition of  claim 1 , wherein the acetylated polysaccharide or derivative thereof is soluble in an aqueous solution. 
     
     
       9. The composition of  claim 8 , wherein the aqueous solution is alkaline and the polysaccharide or derivative thereof is soluble in the aqueous solution up to a concentration of 30 mM. 
     
     
       10. The composition of  claim 1 , further comprising one or more of a thickening agent, a foaming agent, a visualization agent, or a radiopaque agent. 
     
     
       11. The composition of  claim 1 , wherein the multifunctional, multi-armed polyethylene glycol polymer comprises ester groups to provide for degradation via hydrolysis. 
     
     
       12. The composition of  claim 1 , wherein the ratio of multifunctional, multi-armed polyethylene glycol polymer to acetylated polysaccharide or derivative thereof is from 5:1 to 10:1 by mass.